When installing new or oversized tuning pins, it is recommended that the holes be reamed.
All of these reamers are .009 under the diameter of the corresponding tuning pin size and are 5-1/8" long

The following reamers are suggested when installing the corresponding size of tuning pins.
All reamers are 5" long.

137A, B, C, D - $38.32

137E - $56.00